비동기 action을 실행 중간에 cancel시키는 경우

    @Action
    public void cancelTask() {
        TaskMonitor taskMonitor = getApplication().getContext().getTaskMonitor();
        List<Task> tkList = taskMonitor.getTasks();
        System.out.println("Task size : "+tkList.size());
        for(Task t:tkList){
            System.out.println("Task title : "+t.getTitle());
            t.cancel(true);
        }        
    }